I just don't understand why they don't use these departures to make eventful interesting stories.

There should have been more lead up to Jack dying so people were more invested in him as a character.Bo should be going out with a bang maybe finally being on the verge of putting the Dimera's away and then mysteriously disappearing.

A hand should have come over Melanie just as she was leaving to get on the plane and pulled her away.... it could have been Stefano, Andrew, Chad, Gabi, Nick, Ej, or my personal favourite Vivian Alamain on behalf of Lawrence. All left up to speculation as we don't hear anything about it for the next couple of years.